Geochemical characteristics of paleotsunami deposits from the Shizuoka plain on the Pacific coast of middle Japan

Abstract

Copyright © 2021 by The Geochemical Society of Japan. (Mw) of past earthquakes have been previously estimated using geological records (Minoura et al., 1994; Nanayama et al., 2003; Goto et al., 2014; Chagué-Goff et al., 2015; Sawai et al., 2009, 2012, 2015). An event deposit is preliminarily found using grain size changes in a geologic stratum along with multiple other proxies for environmental changes (Watanabe et al., 2020). Additionally, geochemical analysis is widely used to estimate the source of the sediments (Minoura and Nakaya, 1991; Chagué-Goff et al., 2017). Following recent major subduction zone earthquakes, the analysis of tsunami deposits has been increasing to help clarify such geochemical features (Chagué-Goff et al., 2017; Watanabe et al., 2020). The geochemical signatures of tsunami deposits from the southwestern coasts of Spain, New Zealand, the Hawaiian Islands, Mexico and northeastern Japan have also been studied (Minoura et al., 1994; ChaguéGoff, 2010; Roy et al., 2012; Kuwatani et al., 2014; Yamasaki et al., 2015; Goff et al., 2020). Recently, geochemical characteristics of tsunami deposits have been well documented on the Pacific coast in the Tohoku Geochemical characteristics of paleotsunami deposits from the Shizuoka plain on the Pacific coast of middle Japan